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Lithium hydroxide, monohydrate → 1-[4'-(2"-Ethyl-5",7"-dimethylimidazo[4,5-b]pyridin-3-yl)methylphenyl]cyclopent-3-ene-1-carboxylic acid

HRID 1463531
Notizen
Druckvorschau

Reaktionsgleichung

Reaktionsgleichung von HRID 1463531
[CH2:1]([C:3]1[N:13]([CH2:14][C:15]2[CH:20]=[CH:19][C:18]([C:21]3([C:26]([O:28]C)=[O:27])[CH2:25][CH:24]=[CH:23][CH2:22]3)=[CH:17][CH:16]=2)[C:6]2=[N:7][C:8]([CH3:12])=[CH:9][C:10]([CH3:11])=[C:5]2[N:4]=1)[CH3:2].O.[OH-].[Li+]>CO.O>[CH2:1]([C:3]1[N:13]([CH2:14][C:15]2[CH:16]=[CH:17][C:18]([C:21]3([C:26]([OH:28])=[O:27])[CH2:25][CH:24]=[CH:23][CH2:22]3)=[CH:19][CH:20]=2)[C:6]2=[N:7][C:8]([CH3:12])=[CH:9][C:10]([CH3:11])=[C:5]2[N:4]=1)[CH3:2]
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Komponenten

5

Edukt 2

HCID 168937Lithium hydroxide, monohydrateHCID 86747731Methyl 1-[4'-(2"-ethyl-5",7"-dimethylimidazo[4,5-b]pyridin-3-yl)methylphenyl]cyclopent-3-ene-1-carboxylate

Produkt 1

HCID 99295271-[4'-(2"-Ethyl-5",7"-dimethylimidazo[4,5-b]pyridin-3-yl)methylphenyl]cyclopent-3-ene-1-carboxylic acid

Reagenzien, Katalysatoren, Lösungsmittel 2

HCID 887MethanolLösungsmittel
HCID 962
Water
Lösungsmittel

Versuchsvorschrift

A solution of the product of Step 5, above (5.76 g, 14.9 mmol) and lithium hydroxide monohydrate (6.23 g, 148 mmol) in 148 ml of methanol and 148 ml of water was heated at reflux for 2 hours. The reaction was then concentrated in vacuo, the residue was taken up in water and the pH was adjusted to 4 with concentrated HCl when the title compound precipitated as a colorless solid which was filtered off, dried in vacuo and recrystallized first from ethyl acetate/methanol, then from methanol to yield 1.9 g of title compound which was contaminated with 2.5% of 1-[4'-(2"-ethyl-5",7"-dimethylimidazo[4,5-b]pyridin-3-yl)methylphenyl]-2-vinylcyclopropane-1-carboxylic acid. Another recrystallization from methanol yielded 1.5 g of title compound, mp 232°-233° C., now about 98.3% pure, as determined by reverse-phase HPLC using a C-18 Beckman 25 cm long column and 30% pH 2.3 phosphate buffer in acetonitrile as eluant.

Aufarbeitung

  1. temperatureat reflux for 2 hours
  2. concentrationThe reaction was then concentrated in vacuo
  3. customprecipitated as a colorless solid which
  4. filtrationwas filtered off
  5. customdried in vacuo
  6. customrecrystallized first from ethyl acetate/methanol

Quellen und Nachweise

ORD-Eintrag
ord-9c378bc1889041eab06f2abf3b238525
Quelldatensatz
uspto-grants-1994_04
DOI
10.6084/m9.figshare.5104873.v1
Patentnummer
US05300668

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